If a person breaks a Qadhaa Ramadhaan fast with a valid Shar`ee reason, then he will not be sinful, while if he breaks it without a valid reason then he is a sinner, but in both cases only Qadhaa will be required and not Kaffaarah.

Imaam Az-Zayla`ee Rahimahullaah says in Tabyeenul Haqaa’iq: “Kaffaarah is not obligatory for breaking a fast outside the month of Ramadhaan, even if it’s a Qadhaa fast of Ramadhaan, because Kaffaarah had come due to breaking the sanctity of the month of Ramadhaan.”[i]